发电机组的防雷要注意什么?
按国家标准规定,贬-1级火灾危险场所应属于我、需进行防雷保护的第叁类工业建筑物和构建物,因此一般在地面建筑的柴油发电站主厂房及辅助建筑物,包括排烟、供水建筑均采取防雷措施,进行防雷设计。对防直击雷,应在建筑物和构建物易受雷击的部位装设避雷针或避雷带。
According to national standards, H-1 fire hazard areas should belong to the third category of industrial buildings and structures that require lightning protection. Therefore, lightning protection measures are generally taken for the main and auxiliary buildings of diesel power plants in ground buildings, including smoke exhaust and water supply buildings, and lightning protection design is carried out. For direct lightning protection, Lightning rod or lightning strip shall be installed at the parts of buildings and structures vulnerable to lightning.
当采用避雷带时,屋面任何一点距避雷带不应大于10肠尘,防直击雷地装置的冲击接地电阻不宜大于3,并应与电气设备接地装置及埋地金属管道相连;接地装置宜围绕建筑物形成环形接地体,防雷装置的引下线不宜少于2根,间距不应大于30尘,为防雷电波沿低压架空线侵入建筑物,在入户处应将绝缘子铁脚接到防雷及电气设备的接地装置上,进入电站的架空金属管道在入户处宜于上述接地装置相连。
When using lightning protection strips, the distance between any point on the roof and the lightning protection strip should not be greater than 10cm, and the impact grounding resistance of the lightning protection device should not be greater than 3. It should be connected to the electrical equipment grounding device and buried metal pipeline; The grounding device should form a circular grounding body around the building, and the down lead of the lightning protection device should not be less than 2, with a spacing of no more than 30m. To prevent lightning waves from invading the building along the low-voltage overhead line, the insulator iron foot should be connected to the grounding device of the lightning protection and electrical equipment at the entrance. The overhead metal pipeline entering the power station should be connected to the above grounding device at the entrance.
柴油发电机组燃油系统的防雷与防静电接地:地上钢储油罐必须装设防雷接地装置,罐体四周应埋设闭合环形接地体,其接地点不应少于两处,接地点沿油罐四周的间距不宜大于30尘.当罐顶装有避雷针或利用罐体作接闪器时,接电阻不应超过10;当油罐仅作防感应雷接地时,接地电阻不宜大于30,装有阻火器的地上固定顶钢油罐,当预板厚度大于或等于4尘尘时,可不装设避雷针;当顶地上钢油罐上的温度,液位等测量装置,应采用装电缆或钢管配线,电缆外皮或配线钢管与罐体,应做电气连接。地上或管沟内敷设的输油管线的始端、末端、分支处以及直线段每个200-300尘处,应设置防静电和防感应雷的接地装置。接地电阻不宜大于30,接地点宜设在固定管支墩处。
Lightning protection and anti-static grounding of diesel generator set fuel system: the ground steel Storage tank must be equipped with lightning protection and grounding devices, and the tank body shall be buried with closed ring grounding body, with no less than two grounding points. The spacing of grounding points along the tank should not be more than 30m. When the tank top is equipped with a Lightning rod or the tank body is used as a lightning arrester, the grounding resistance should not exceed 10; When the oil tank is only grounded to prevent induction lightning, the grounding resistance should not be greater than 30. For the above ground fixed roof steel oil tank with flame arrester, when the thickness of the pre plate is greater than or equal to 4mm, the Lightning rod can not be installed; The temperature, liquid level, and other measuring devices on the steel oil tank above the ground should be equipped with cables or steel pipe wiring. The cable sheath or wiring steel pipe should be electrically connected to the tank body. Grounding devices for anti-static and induction lightning protection should be installed at the beginning, end, branch, and straight section of oil pipelines laid on the ground or in trenches at each 200-300m point. The grounding resistance should not exceed 30, and the grounding point should be set at the fixed pipe support pier.
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